<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>
      <!-- 表单 -->
      <el-form :model="loginForm" :rules="loginRules" ref="loginRef" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" placeholder="请输入用户名" prefix-icon="iconfont icon-xingmingyonghumingnicheng" autocomplete="off"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" placeholder="请输入密码" prefix-icon="iconfont icon-mima" type="password" autocomplete="off"></el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="reSet">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 登录表单的数据绑定对象
      loginForm: {
        username: '',
        password: '',
        isLogin: false
      },
      // 表单的验证规则
      loginRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      },
    }
  },
  methods: {
    login() {
      // 先用elementui的 validate进行预校验
      this.$refs.loginRef.validate((valid) => {
        // 验证返回布尔值valid ，false为验证失败
        if(!valid) return

        // 登录成功
        this.$http.post('login', this.loginForm).then(res => {
          console.log(res.data)
          if(res.data.meta.status !== 200) {
            this.$message.error('登录失败 '+ res.data.meta.msg)
          }else {
            this.$message.success('登录成功')
            // 登录成功后token 应保存到客户端的sessionStorage中
            // 除了登录之外的API接口必须在登录之后才能访问
            // token只应该在网站打开期间生效，所以将它保存在sessionStorage中
            window.sessionStorage.setItem('token', res.data.data.token)
            // 通过编程式导航跳转到后台主页 /home
            this.$router.push('/home')
          }
        })
      })
      console.log("submit")
    },
    reSet() {
      // 重置登录表单
      this.$refs.loginRef.resetFields()
    },
  },
}
</script>
<style lang="scss" scoped>
  .login_container {
    height: 100%;
    background-color: #2b4b6b;
  }
  .login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    // 居中显示
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
  }
  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
  .btns {
    display: flex;
    justify-content: flex-end;
  }
  .login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
  }
  
</style>